I am learning to code JavaScript. In this script, I want a link to not go to its specified location, but to change the text in the paragraph before it. I have created a function to achieve it onclick, but the function is not able to return false.
<html>
<head>
<title>Javascript Test #6</title>
<script type="text/javascript">
document.getElementById("links").onclick=writeData();
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html"> Click here to change the paragraph content </a>
</body>
</html>
I am learning to code JavaScript. In this script, I want a link to not go to its specified location, but to change the text in the paragraph before it. I have created a function to achieve it onclick, but the function is not able to return false.
<html>
<head>
<title>Javascript Test #6</title>
<script type="text/javascript">
document.getElementById("links").onclick=writeData();
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html"> Click here to change the paragraph content </a>
</body>
</html>
2 Answers
Reset to default 3document.getElementById("links").onclick=writeData;
Don't use the brackets. They force your function to evaluate. but you want to assign the function.
EDIT:
Of Course, you need to Assign your Function after the Document has been loaded. The way it is right now, there will be no element with id links when the assignment is executed. Basically, just put your script block below the links element.
<html>
<head>
<title>Javascript Test #6</title>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html"> Click here to change the paragraph content </a>
<script type="text/javascript">
document.getElementById("links").onclick=writeData;
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</body>
</html>
EDIT (Using window.onload):
<html>
<head>
<title>Javascript Test #6</title>
<script type="text/javascript">
window.onload = function() {
document.getElementById("links").onclick=writeData;
}
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html"> Click here to change the paragraph content </a>
</body>
</html>
When dealing with document.getElementById, you should ensure that at the time of the call, the elements are in DOM. Just use an inline click handler:
<html>
<head>
<title>Javascript Test #6</title>
<script type="text/javascript">
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html" onclick="return writeData();"> Click here to change the paragraph content </a>
</body>
</html>
Or, change the order of things: first have the DOM ready, and after that , insert you js script:
<html>
<head>
<title>Javascript Test #6</title>
</head>
<body>
<p id="para">Unchanged Paragraph Content</p>
<br/>
<a id="links" href="javascript-return.html" onclick="return writeData();"> Click here to change the paragraph content </a>
<script type="text/javascript">
document.getElementById("links").onclick=writeData;
function writeData()
{
document.getElementById("para").innerHTML="Changed Paragraph Content";
return false;
}
</script>
</body>
</html>
see it in action here: http://jsfiddle/2CpcF/
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